CVE-2026-34085

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Summary

CVECVE-2026-34085
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-25 17:17:09 UTC
Updated2026-05-12 15:37:22 UTC
Descriptionfontconfig before 2.17.1 has an off-by-one error in allocation during sfnt capability handling, leading to a one-byte out-of-bounds write, and potentially a crash or code execution. This is in FcFontCapabilities in fcfreetype.c.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000140000 probability, percentile 0.028310000 (date 2026-05-12)

Problem Types: CWE-193 | CWE-193 CWE-193 Off-by-one Error

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
3.1CNACVSS5.9MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Fontconfig Project Fontconfig 2.17.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fontconfig Project Fontconfig affected 2.17.1 semver Not specified

References

ReferenceSourceLinkTags
gitlab.freedesktop.org/fontconfig/fontconfig/-/work_items/481 [email protected] gitlab.freedesktop.org Issue Tracking
gitlab.freedesktop.org/fontconfig/fontconfig/-/merge_requests/446 [email protected] gitlab.freedesktop.org Patch
gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/b9bec06d73340f1b5727302d13ac3d... [email protected] gitlab.freedesktop.org Patch
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